Hole drilling and protecting construction method of soft-broken coal seam

Abstract

The invention provides a hole drilling and protecting construction method of a soft-broken coal seam. The method comprises the steps that a soft-broken coal seam hole drilling and protecting device is installed at a drill hole of a coal seam roadway; the drill hole is supported while hole drilling and broaching operation is conducted through the hole drilling and protecting construction method of the soft-broken coal seam, and extraction of a drilling tool is prevented from being influenced by collapse and contraction; and high-pressure airflow of a rotary sealing water and air supplying device pushes a water flow to reach a central backflow drill bit, and water slag is outwards discharged through an inner chip removal drill rod. According to the hole drilling and protecting construction method of the soft-broken coal seam, the condition that formed holes are destroyed by an outer chip removal water flow and the drill bit when the drill bit is pulled out is avoided, the problems that the formed holes in the soft-broken coal seam are prone to collapsing and contracting, and gas is not prone to being discharged can be effectively solved, and the gas extraction quality is improved; and the speed of gas extraction hole construction is increased, construction safety is ensured, and the hole drilling and protecting construction method is an innovation for the soft-broken coal seam hole drilling and protecting device.

Description

technical field [0001] The invention belongs to the technical field of drilling construction for gas drainage in coal mines, and in particular relates to a construction method for drilling and protecting holes in soft and broken coal seams. Background technique [0002] Gas drainage technology is a necessary guarantee for mine gas safety control. Affected by the coal seam itself, safe and reliable gas drainage must be premised on pore-forming technology. For a long time, the difficulty of forming holes in soft and broken coal seams has been the main technical problem restricting its efficient gas extraction. At present, gas drainage and forming holes are achieved by using drill bits and drill rods to lengthen them. The soft and broken coal seam has the characteristics of soft coal quality, poor permeability, and high gas pressure, which makes the holes prone to shrinkage and collapse, which causes the problem of coal seam stuck holes, making the drilling tools unable to be ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the present invention provides a construction method for drilling and protecting holes in soft and broken coal seams, which uses pipes to realize the purpose of preventing collapse and extracting gas, and uses a brand-new slag discharge system at the same time, thereby effectively solving the problem of problems Hole problems, improving the efficiency of drilling anti-collapse and slag removal

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